Remove unused imports in webkitpy with using autoflake.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py

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 import json
-import logging
 
 
 class ProcessJsonData(object):
 
     def __init__(self, current_result_json_dict, old_failing_results_list, old_full_results_list):
         self._current_result_json_dict = current_result_json_dict
         self._old_failing_results_list = old_failing_results_list
         self._old_full_results_list = old_full_results_list
         self._final_result = []
 
@@ skipping 104 matching lines @@
 
         # There must be at least one archived result to be processed
         if self._current_result_json_dict:
             process_json_data = ProcessJsonData(self._current_result_json_dict,
                                                 self._old_failing_results_list, self._old_full_results_list)
             self._final_result = process_json_data.generate_archived_result()
             final_json = json.dumps(self._final_result)
             final_json = 'ADD_RESULTS(' + final_json + ');'
             archived_results_file_path = self._filesystem.join(self._results_directory, 'archived_results.json')
             self._filesystem.write_text_file(archived_results_file_path, final_json)